Decompiler is usually not that good. I guess what you are trying to do
is linking sytsem libraries into your own application. If this is the
case, you don't need to use a decompiler, use an assember is good
enough. Try to use ildasm.exe to disassemble it, then re-assemble it
using ilasm.exe. Since all system libraries are strong named, so you
need to merge them into your own application, otherwise it wouldn't
run. There are some other issues to worry about, such as resource
files. Overall, it's not an easy job.
Huihong
Serious .NET Protection with native compilation
http://www.remotesoft.com/linker
http://www.remotesoft.com/deprotector